Finding the Fourth Proportional to 72,048.80, 108,137.20 and 42,429.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,048.80 : 108,137.20 = 42,429.60 : x
2. Step 2: Convert to fraction form
   72,048.80/108,137.20 = 42,429.60/x
3. Step 3: Cross multiply
   72,048.80x = 108,137.20 × 42,429.60
4. Step 4: Simplify right side
   72,048.80x = 4,588,218,141.12
5. Step 5: Solve for x
   x = 4,588,218,141.12/72,048.80
6. Step 6: Final answer
   x = 63,682.09